diff --git a/docs/index.md b/docs/index.md
index 089bb75c..bfb82ce6 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -1691,8 +1691,6 @@ class Settings(BaseSettings):
 
 If a shortcut collides (is mapped to multiple fields), it will apply to the first matching field in the model.
 
-See the [test cases](../tests/test_source_cli.py) for more advanced usage and edge cases.
-
 ### Integrating with Existing Parsers
 
 A CLI settings source can be integrated with existing parsers by overriding the default CLI settings source with a user
diff --git a/pydantic_settings/sources/base.py b/pydantic_settings/sources/base.py
index 96c019be..b2c4d166 100644
--- a/pydantic_settings/sources/base.py
+++ b/pydantic_settings/sources/base.py
@@ -416,6 +416,7 @@ class Settings(BaseSettings):
                 model_fields: dict[str, FieldInfo] = annotation.model_fields
 
             # Find field in sub model by looking in fields case insensitively
+            field_key: str | None = None
             for sub_model_field_name, sub_model_field in model_fields.items():
                 aliases, _ = _get_alias_names(sub_model_field_name, sub_model_field)
                 _search = (alias for alias in aliases if alias.lower() == name.lower())
diff --git a/pydantic_settings/version.py b/pydantic_settings/version.py
index 5bed97f9..79585b42 100644
--- a/pydantic_settings/version.py
+++ b/pydantic_settings/version.py
@@ -1 +1 @@
-VERSION = '2.10.0'
+VERSION = '2.10.1'